Smith & Wesson 2nd Gen 9mm Pistol Firing Pin Factory New OEM Model 639 659 - 103660000

Smith & Wesson 2nd Generation 9mm Pistol Firing Pin — Factory New OEM

Part #103660000 | Factory New | 2nd Generation | Model 639 / 659 | 9mm | OEM

Genuine factory new Smith & Wesson firing pin for 2nd Generation stainless 9mm semi-automatic pistols. The firing pin strikes the cartridge primer to initiate ignition. Common firing pin failure modes include: broken or chipped firing pin tip (causes consistent misfires), firing pin channel fouling or debris (causes sluggish pin travel and light primer strikes), and cracked firing pin body (causes intermittent misfires under sustained fire). This OEM replacement restores factory-correct ignition reliability.

Compatible Models

• 2nd Gen Stainless Single-Stack 9mm: Model 639 (stainless variant of the Model 39/439)
• 2nd Gen Stainless Double-Stack 9mm: Model 659 (stainless variant of the Model 59/459)
• 2nd Gen Steel (verify fitment): Model 539, 559 — share the same 2nd Gen platform; confirm with your gunsmith before ordering

Specifications

• Part Number: 103660000
• Type: Firing Pin
• Platform: 2nd Generation DA/SA Semi-Automatic (9mm)
• Caliber: 9mm
• Finish: Stainless (matches 639/659 platform)
• Condition: Factory New
• OEM: Genuine Smith & Wesson factory part

Installation

Slide disassembly required. Professional gunsmith installation recommended. Function test for positive primer strike and reliable extraction after installation.